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doc/costs.txt

 

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Costs

 

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=====

 

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User thought is most expensive.  User time spent waiting is next.

 

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Developer time for the version control system is also relatively

 

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expensive.  

 

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Machine resources are cheap.  In particular; disk is generally very

 

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cheap; an ordinary programmer earns enough to buy hundreds of GB of

 

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disk per day.  However, it is sometimes limited, as on a laptop.

 

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Therefore it is generally OK to trade off disk space for anything

 

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else, but it should be possible to be compact.

 

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Network round trips are very bad.

 

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Consider scalability also; avoid anything worse than O(n).  Try to

 

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avoid anything that needs e.g. to hold the whole tree in memory at any

 

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time, or to hold the entire history of the project.

 

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